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Vickers Crack Nucleation of Glass Sheets Coated by Thin Silica Gel Layers
Author(s) -
Maschio Roberto Dal,
Pegoretti Alessandro,
Rizzo Caterina,
Soraru Gian D.,
Carturan Giovanni
Publication year - 1989
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1989.tb06098.x
Subject(s) - materials science , composite material , nucleation , elastic modulus , ultimate tensile strength , modulus , silicon , vickers hardness test , indentation hardness , young's modulus , microstructure , metallurgy , chemistry , organic chemistry
SiO 2 gel layers of different thickness have been deposited on glass sheets by dipping from gelling solutions with different concentrations of silicon alkoxide. Some mechanical properties of the coated samples such as hardness (H), elastic modulus (E), crack formation tendency, and tensile stress in the film (σ) have been measured by microindentation techniques and slide deflection. SiO 2 films deposited from more dilute solutions had lower H, E, and σ values, accounting for the observed higher resistance to crack nucleation in comparison with that found for samples prepared from more concentrated solutions.